The stage begins in a desert area that doesn't too closely resemble the "forgotten city" the portrait's title foretells. Fact is, the main stage lies underground. To get to it, you'll have to defeat the giant worm early in the stage, then allow the sinking sand to suck you under.

Once underground, you can head either southeast or southwest. The path to the southeast doesn't lead to much—a dead-end and a save spot—as the southwest path is what leads you to the meat of the stage. Make your way to the furthest corner to the west you can reach to grab the Griffon Wing skill cube.

You'll go far south through the stage before turning north again to reach the very center of the map. That's where you'll find the boss fight with Mummy Man.

Mummy Man is one of the easiest boss fights in the game. He's very slow, and all of his attacks are telegraphed and easy to see coming. Stand in front of Mummy Man with a weapon that's got some range. Attack at maximum range and you should be able to see his unraveling attack happen before it hits you. When you see a stretch of the mummy's wraps flying towards you, simply double jump over the enemy's head and start attacking from behind.

Also watch out for Mummy Man's floating brick attacks. For one attack, the bricks will form a vertical wall and try to pin you against one of the room's walls. Simply use the Griffon Wing jump to escape this attack before the blocks eject their spikes. Another of the block attacks has a group of the blocks surround you in a loose ring formation. After they've aligned themselves in formation, the blocks will one by one fire towards you. Simply jump away to avoid the blocks.